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async demos updated for uasyncio V3

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Peter Hinch 2020-06-12 15:08:59 +01:00
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13
async/ASYNC.md
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@ -21,13 +21,16 @@ applications performing fast concurrent input over devices such as UARTs.
# Demo scripts
These require uasyncio V3. This is incorporated in daily builds and will be
available in release builds starting with MicroPython V1.13. The demos assume
a Pyboard.
* `asnano.py` Runs until the usr button is pressed. In this demo each meter
updates independently and mutually asynchronously to test the response to
repeated display refreshes.
* `asnano_sync.py` Provides a less hectic visual by only updating the display
when all data has been acquired. Uses a `Barrier` object to achieve the
necessary synchronisation.
These demos require [asyn.py](https://github.com/peterhinch/micropython-async/blob/master/asyn.py).
* `asnano_sync.py` Provides a less hectic visual. Display objects update
themselves as data becomes available but screen updates occur asynchronously
at a low frequency. An asynchronous iterator is used to stop the demo when the
pyboard usr button is pressed.
###### [Main README](../README.md)

74
async/asnano.py
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@ -3,27 +3,8 @@
# Adafruit 1.5" 128*128 OLED display: https://www.adafruit.com/product/1431
# Adafruit 1.27" 128*96 display https://www.adafruit.com/product/1673
# The MIT License (MIT)
# Copyright (c) 2018 Peter Hinch
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# Copyright (c) 2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
# WIRING (Adafruit pin nos and names)
# Pyb SSD
@ -43,15 +24,18 @@ import gc
from ssd1351 import SSD1351 as SSD
# Initialise hardware and framebuf before importing modules
pdc = machine.Pin('X1', machine.Pin.OUT_PP, value=0)
pcs = machine.Pin('X2', machine.Pin.OUT_PP, value=1)
prst = machine.Pin('X3', machine.Pin.OUT_PP, value=1)
spi = machine.SPI(1)
#pdc = machine.Pin('X1', machine.Pin.OUT_PP, value=0)
#pcs = machine.Pin('X2', machine.Pin.OUT_PP, value=1)
#prst = machine.Pin('X3', machine.Pin.OUT_PP, value=1)
#spi = machine.SPI(1)
pdc = machine.Pin('Y1', machine.Pin.OUT_PP, value=0)
pcs = machine.Pin('Y2', machine.Pin.OUT_PP, value=1)
prst = machine.Pin('Y3', machine.Pin.OUT_PP, value=1)
spi = machine.SPI(2)
gc.collect() # Precaution befor instantiating framebuf
ssd = SSD(spi, pcs, pdc, prst, height) # Create a display instance
import uasyncio as asyncio
import asyn
import pyb
import uos
from writer import CWriter
@ -73,7 +57,6 @@ wri.set_clip(True, True, False)
color = lambda v : RED if v > 0.7 else YELLOW if v > 0.5 else GREEN
txt = lambda v : 'ovr' if v > 0.7 else 'high' if v > 0.5 else 'ok'
@asyn.cancellable
async def meter(n, x, text, t):
print('Meter {} test.'.format(n))
m = Meter(wri, 5, x, divisions = 4, ptcolor=YELLOW,
@ -87,29 +70,30 @@ async def meter(n, x, text, t):
refresh(ssd)
await asyncio.sleep_ms(t)
@asyn.cancellable
async def flash(n, t):
led = pyb.LED(n)
try:
while True:
led.toggle()
await asyncio.sleep_ms(t)
except asyn.StopTask:
led.off()
print('LED {} was cancelled.'.format(n))
while True:
led.toggle()
await asyncio.sleep_ms(t)
async def killer():
async def killer(tasks):
sw = pyb.Switch()
while not sw():
await asyncio.sleep_ms(100)
await asyn.Cancellable.cancel_all()
for task in tasks:
task.cancel()
async def main():
tasks = []
tasks.append(asyncio.create_task(meter(1, 2, 'left', 700)))
tasks.append(asyncio.create_task(meter(2, 50, 'right', 1000)))
tasks.append(asyncio.create_task(meter(3, 98, 'bass', 1500)))
tasks.append(asyncio.create_task(flash(1, 200)))
tasks.append(asyncio.create_task(flash(2, 233)))
await killer(tasks)
print('Press Pyboard usr button to stop test.')
loop = asyncio.get_event_loop()
loop.create_task(asyn.Cancellable(meter, 1, 2, 'left', 700)())
loop.create_task(asyn.Cancellable(meter, 2, 50, 'right', 1000)())
loop.create_task(asyn.Cancellable(meter, 3, 98, 'bass', 1500)())
loop.create_task(asyn.Cancellable(flash, 1, 200)())
loop.create_task(asyn.Cancellable(flash, 2, 233)())
loop.run_until_complete(killer())
try:
asyncio.run(main())
finally: # Reset uasyncio case of KeyboardInterrupt
asyncio.new_event_loop()

132
async/asnano_sync.py
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@ -3,27 +3,8 @@
# Adafruit 1.5" 128*128 OLED display: https://www.adafruit.com/product/1431
# Adafruit 1.27" 128*96 display https://www.adafruit.com/product/1673
# The MIT License (MIT)
# Copyright (c) 2018 Peter Hinch
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# Copyright (c) 2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
# WIRING (Adafruit pin nos and names)
# Pyb SSD
@ -43,15 +24,18 @@ import gc
from ssd1351 import SSD1351 as SSD
# Initialise hardware and framebuf before importing modules
pdc = machine.Pin('X1', machine.Pin.OUT_PP, value=0)
pcs = machine.Pin('X2', machine.Pin.OUT_PP, value=1)
prst = machine.Pin('X3', machine.Pin.OUT_PP, value=1)
spi = machine.SPI(1)
#pdc = machine.Pin('X1', machine.Pin.OUT_PP, value=0)
#pcs = machine.Pin('X2', machine.Pin.OUT_PP, value=1)
#prst = machine.Pin('X3', machine.Pin.OUT_PP, value=1)
#spi = machine.SPI(1)
pdc = machine.Pin('Y1', machine.Pin.OUT_PP, value=0)
pcs = machine.Pin('Y2', machine.Pin.OUT_PP, value=1)
prst = machine.Pin('Y3', machine.Pin.OUT_PP, value=1)
spi = machine.SPI(2)
gc.collect() # Precaution befor instantiating framebuf
ssd = SSD(spi, pcs, pdc, prst, height) # Create a display instance
import uasyncio as asyncio
import asyn
import pyb
import uos
from writer import CWriter
@ -66,66 +50,74 @@ RED = SSD.rgb(255, 0, 0)
YELLOW = SSD.rgb(255, 255, 0)
BLACK = 0
CWriter.set_textpos(ssd, 0, 0) # In case previous tests have altered it
wri = CWriter(ssd, arial10, GREEN, BLACK, verbose=False)
wri.set_clip(True, True, False)
color = lambda v : RED if v > 0.7 else YELLOW if v > 0.5 else GREEN
txt = lambda v : 'ovr' if v > 0.7 else 'high' if v > 0.5 else 'ok'
@asyn.cancellable
async def meter(bar, x, text):
m = Meter(wri, 5, x, divisions = 4, ptcolor=YELLOW,
label=text, style=Meter.BAR, legends=('0.0', '0.5', '1.0'))
l = LED(wri, ssd.height - 16 - wri.height, x, bdcolor=YELLOW, label ='over')
while True:
v = int.from_bytes(uos.urandom(3),'little')/16777216
m.value(v, color(v))
l.color(color(v))
l.text(txt(v), fgcolor=color(v))
# Demo would work if data acquisition was slow. But even with fast
# running we pause here until all meters have updated and the main
# task is ready to refresh the display.
await bar
class MyMeter(Meter):
def __init__(self, x, text):
CWriter.set_textpos(ssd, 0, 0) # In case previous tests have altered it
wri = CWriter(ssd, arial10, GREEN, BLACK, verbose=False)
wri.set_clip(True, True, False)
super().__init__(wri, 5, x, divisions = 4, ptcolor=YELLOW, label=text,
style=Meter.BAR, legends=('0.0', '0.5', '1.0'))
self.led = LED(wri, ssd.height - 16 - wri.height, x, bdcolor=YELLOW, label ='over')
self.task = asyncio.create_task(self._run())
async def _run(self):
while True:
v = int.from_bytes(uos.urandom(3),'little')/16777216
self.value(v, color(v))
self.led.color(color(v))
self.led.text(txt(v), fgcolor=color(v))
# Slow asynchronous data acquisition might occur here. Note
# that meters update themselves asynchronously (in a real
# application as data becomes available).
await asyncio.sleep(v) # Demo variable times
@asyn.cancellable
async def flash(n, t):
led = pyb.LED(n)
try:
while True:
led.toggle()
await asyncio.sleep_ms(t)
except asyn.StopTask:
except asyncio.CancelledError:
led.off() # Demo tidying up on cancellation.
class Killer:
def __init__(self):
self.sw = pyb.Switch()
async def wait(self, t):
while t >= 0:
if self.sw():
return True
await asyncio.sleep_ms(50)
t -= 50
return False
# The main task instantiates other tasks then does the display update process.
@asyn.cancellable
async def main(loop):
async def main():
print('Press Pyboard usr button to stop test.')
bar = asyn.Barrier(4, refresh, (ssd,))
# Asynchronously flash Pyboard LED's. Because we can.
loop.create_task(asyn.Cancellable(flash, 1, 200)())
loop.create_task(asyn.Cancellable(flash, 2, 233)())
leds = [asyncio.create_task(flash(1, 200)), asyncio.create_task(flash(2, 233))]
# Task for each meter and GUI LED
loop.create_task(asyn.Cancellable(meter, bar, 2, 'left')())
loop.create_task(asyn.Cancellable(meter, bar, 50, 'right')())
loop.create_task(asyn.Cancellable(meter, bar, 98, 'bass')())
try:
while True:
await asyncio.sleep_ms(800)
# If necessary wait until all meters have updated.
# Barrier callback updates display.
await bar
except asyn.StopTask:
ssd.fill(0) # Clear display at end.
mtasks =[MyMeter(2, 'left').task, MyMeter(50, 'right').task, MyMeter(98, 'bass').task]
k = Killer()
while True:
if await k.wait(800): # Switch was pressed
break
refresh(ssd)
for task in mtasks + leds:
task.cancel()
await asyncio.sleep_ms(0)
ssd.fill(0) # Clear display at end.
refresh(ssd)
async def killer():
sw = pyb.Switch()
while not sw():
await asyncio.sleep_ms(100)
await asyn.Cancellable.cancel_all()
def test():
try:
asyncio.run(main())
finally: # Reset uasyncio case of KeyboardInterrupt
asyncio.new_event_loop()
print('asnano_sync.test() to re-run test.')
loop = asyncio.get_event_loop()
loop.create_task(asyn.Cancellable(main, loop)())
loop.run_until_complete(killer())
test()